Double-deck bascule-bridge.



1. B. STRAUSS.

DOUBLE DECK BASCULE BRIDGE.

APPLlCATlON FLD MAR. I8, 190B.

Patented Feb. 8, 19H5.

2 SHEETS-SHEET I.

l, I 74/ gf/MVK *L B. STRAUSS.

DOUBLE DECK BASCULE BRIDGE.

APPLICATION FILED MAR. I8, 1908.

Patented Feb, 8, 1916.

L'Ifmys,

JOSEPH B.

STRAUSS, OF CHICAGO, ILLINOIS.

DOUBLE-DECK BASCULE-BRIDGE.

To all 'whom z'zf may concern.'

Be it known that I, JOSEPH B. citizen ofthe United cago, in the countyIllinois, have invented a certain new and useful Improvement inDouble-Deck Bascule-Bridges, of which the following is a specification.I

This invention relates to bascule bridges, and has for its object toprovide a new and improved bridge of this description having twodecks orthoroughfares in different hori* zontal planes.

The invention is illustrated in the accompanying drawings, wherein-Figure l is a view'showing a doubleleaf bridge embodying my invention;Fig. 2 is a sectional view on line 2-2 of Fig. l; Fig. 3 is a sectionalview taken on line 3-3 of Fig. l; Fig. 4 is an enlarged sectional viewS'rlzAUss, a States, resldmg at Chithrough one `of the rail supportinggirders;

Fig. 5 is a view of one form of bumper; Fig. 6 isa sectional view takenon line 6-6 of Fig. 5; Fig. 7 is a view showing a modified form ofbumper.

Like letters refer to like parts throughout the several figures.

vReferring now to the drawings, I have shown in Fig. l a double leafbascule bridge. The two leaves are practically duplicates, and Iwill/therefore In this construction the main leaf 1 may be ofany'desired construction, and is mounted upon suitable trunnio i so thatit may be lifted and lowered. Sultable supporting devices 2 are mountedupon proper foundations, and the main trusses or girders 3 of the mainleaf are connected thereto by trunnions 4. The trusses 3 aresemi-through trusses and projectabove the Hoor, but not above theclearance line. If desired a suitable walk 5 for' pedestrians maybe'located atlthe" side of the main leaf, as shown in Figs. 2 and 3. Inthis construction the main .girders 3 are provided with a series ofsidewalk brackets 6, connectedto the side-walk iary leaf 10 located ingirders 7. These sidewalk "girders are pivoted at one end tothe braces 8fastenedto with the main leaf is a secondary or auxila differenthorizontal plaine from the main leaf, and preferably above it, the twoleaves being 'pivotally com neetedtogethen* The auxiliary leaf is pivvoted at one end to the inainsupportingfdey Specification of LettersPatent. Application filed March 18, 1908.

of Cook and State of describe one of them.-

wvhich if desired may be devices 2 by means of` suitable pivots ortrunm'ons 9. Associated Patented nee. s, reis. serial Np. 421,930.

vices 2, the pivots therefor being in the same ferftical line with thepivots for the main The main supporting devices 2 are enlarged at theirupper ends and have pivoted thereto by pivots l2 the two the auxiliaryleaf. These grders carry the rails 13 which are used when the auxiliaryleaf is arranged to be used for street, elevated or railway ears, or thelike. Supporting posts 14.- are provided at intervals pivotally`connecting the two leaves together. l hese posts preferably connect theleaves together at the panel points as shown. rlhese supporting postsare iiared or enlarged at their upper end like the main supports 2 andthe girders ll carrying the rails are pivoted thereto see Fig. 2).Theposts on each side of the bridge are connected together in anydesired manner, as by the connecting pieces 1 5. The supporting postsare also connected by pivots girders 3 of the main leaf. -Vifhen' theside- Walk is used these supporting posts are pro: vided with lateralprojections 18 to which are pivoted the sidewalk girders 7. Theside-walk 5 issuitably mounted on the girders 7 and 20, and a suitablehand-rail 2l is provided. One form of the girders 1l is illustrated. inFig. 4, wherein'such girders are shown as made up of. pieces. The topianges of the gir-dersV are provided with bent plates 22which areconnected together at intervals at the top by straps In the V thusformed, I place a bearing block2a supported upon some cushioningmaterial 25. On the outstanding ends or legs ofthe flanges are placedsuitable guard rails 26 which are bolted securely in position on theianges. To stitfen these outstanding legs gusset plates 27 may beprovided;

It will thus be seen that the rails are placed directly on the centerline ofthe girders. This lightens the structure and secures 'greatstability. When the main leaves are girders 1l of 17 to the main Icenter ofgravity of the structure remains l in the main trunnions ofthenain leaf, and greater stability is secured. .This coi1str1m`` tionalso does away with the heavyooi systesifetherwlse necessary, andpermits an ornamental structure. The main girders 3 of the main leaf areconnected together by the floor girders 28 which carry the floor 29.

with thetanchor post 45.

To provide for any unbalanced load I arrange a bumping; device at thetail end of the main leaf. ,This bumping device 1s illustrated in detailin Figs. 5 and 6. The

. rope 39 is connected to said lever. The main leaf is operated by meansof the rack 40 and the gear 41. When the main leaf is closed the tailend strikes the bumper plate which tends to stop it. The striking of theg bumper plate moves it upwardly against the compression of the spring,and the pawl engages the teeth of the post 31 and holds it in thisposition, thus preventing the recoil 'ofthe spring against' the tail endof the main leaf. When the main leaf has come to rest the operator pullsthe rope 3,9 and re- 80 leases the post 31, the spring moving it untilthe bumper plate engages the tail end of the leaf.

. In Fig. 7 a modified form of bumper device used with a single spanbridge is shown. In

Athis construction the end of the leaf 48 farthest from the pivots isprovided with inclined faces which engage inclined blocks 51, arrangedto slide inaguiding and holding device 49 fastened to the pier. Theseblocks yare provided with springs 50 which act asa cushion. The end ofthe leaf is also pro-v vided with a centering pin 52 which engages ahole 53 in proper position to receive it. When the leaf .is closed thebeveled faces on the endof the part 48 engage the beveled faces on theparts 51 and force the parts 51 back agalnst the pressure -of thesprings 50.

It wlll be noted that in the construction ofP bridge herein illustratedthe main leaf and the secondary leaf are separate and distinct fromeachother, and are each provided A`with an independent set of girders,vthese girders being connected together by posts extending between thegirders or trusses at the panel oints. The supporting devices areprefera ly pin-connected to the girders. It will furth'er be noted thatwhen the secondary leaf is used for cars it is provided with a Stringerhaving anupper flange 23 forming a direct rail support. It will alsoloe-noted that the supports 2 project between the two girders 11, suchgirders being sym- -metrically disposed thercabout, thus permitting therails to be carried directly over the mam girders of the main leaf, therails being directly supported upon the girders vof the secondary leaf.A counterweight 54 that the secondary leaf is` provided with a series ofgirders by means of which it is connected with the main leaf, therebeing cross connections between said vgirders at intervals, the spacesbetween said cross connections being open. l

Where I have used the term semi-through trusses I mean girders whichproject through the roadway ioor but are not cross connected above theroadway floor.

I claim: I

1. A bascule bridge comprising a main leaf and a secondary leaf indifferent horizontal planes, a support for said leaves to which they arepivotally connected at different points so as to rotate about differentcenters, whereby said leaves move relatively when thebridge is opened.

2. A bascule bridge comprising a main leaf and a secondary leaf, bothpivoted to a stationary support, and pivoted posts connecting the twoleaves together near the outer ends said posts pivoted to both leaves.

3. A bascule bridge comprising a main leaf and a secondary leaf bothpivoted to a single support, the pivots thereof being in thesamevertical plane and means for moving the two leaves simultaneously.

4. A bascule bridge comprising a main leaf and a secondary leaf indifferent hori- `zontal planes, and pivotally connected to a the lowerleafback of the pivotal point thereof to balance the weight of bothleaves as they are moved about their pivotal points.

5. A bascule bridge comprising a main leaf and a secondary leaf mountedupon pivots and connected together, and a counterweight connected withone leaf back of the pivotal point thereof arranged to counterbalancethe weight of both leaves as they' are moved about their pivotal points.Y

6. A bascule bridge comprising a main leaf and a secondary leaf, a fixedsupport to which they are pivoted, supporting posts movably connectingthem together, said posts having flared tops, the girders of thesecondary leaf connected to said flared tops andy extending at rightangles thereto.

-7.'-A bascule bridge comprising a main leaf having longitudinal girdersat each side support to which said Limena eaves are pivotally connected,posts upon which the secondary leaf is mounted, said posts connectedwith the trusses of the main leaf at separated points therealong bypivotal connections,

9. A bascule bridge comprising a main leaf, trusses upon which it ismounted, a secondary leaf above the main leaf, a fixed support to whichsaid main and secondary leaves are pivotally connected, posts extendingfrom the trusses of the mainleaf at the panel points and connecting withsaid secondary leaf, said posts connected to both leaves by pivotalconnections.

l0. A bascule bridge comprising a inain leaf and a secondary leaf, oneabove the other, a fixed support to which said inain and secondaryleaves are pivotally connected, each leaf provided with trusses, thelower trusses being below the level of the upper leaf, and connectionsbetween the two leaves so that one is supported upon the other.

1l. A. bascule bridge comprising a main leaii and a secondary leaf indifferent planes, a support to which they are pivoted, two gir-dersforming part of the secondary leaf, a support projecting between saidgirders and to which they are attached, and a connection between saidsupport and the main l "af, i

main and secondary l2, A bascule bridge comprising a main leaf and asecondary leaf in different planes two girders forming part of the leaf,a .support therefor, one of the being` attached to each 'side of so asto be synunetrically disposed thereabout, and a connection between saidsupport and the main leaf.

13. A bascule leaf and a secondary girders the support leaf in differentplanes, a support to which they are pivoted, two girders forming part ofa support therefor, one of the girders being attached to each side ofthe support so as to be symmetrically disposed thereabout, the gil-dersbeing pivotally connected to the support, and a pivotal connectionbetween said support and the main leaf.

14. A bascule bridge comprising a main leaf and a secondary leaf locatedin different planes, a fixed support to which said leaves are pivotallyconnected, posts extending between the two leaves`-v the ends of saidposts pivotally connected with said leaves, means for moving one of saidleaves about its pivotal connection, said posts transmitting the motionto the other leaf.

4JOSEPH B. STRAUSS.

Vlitnesses:

DONALD M,

Charna, EDNA K. REYNOLDS.

bridge comprisii'ig a .main

the secondary leaf,

